Talks about The War more than is strictly necessarily.
Overly grizzled.
Spits chewed tobacco on the floor even when it's inappropriate.
Turns everything into a teachable moment.
A character from every war movie ever.

"You mean you never looked out past the unending horrors of the cosmos and the churning insanity of the Warp at those tiny points of light beyond the Emperor's Grace and weren't like - 'wish I could see 'em up close?"

"Huh, Must be just me."

You've got an idiot punk/punkette young adult who desperately, desperately wants to be the hero in a Rogue Trader campaign, all swashy-coattails, big hats and adventure committing sweet, sweet xeno-heresy with Eldar dancing girls and outsmarting Tau traders . . . and who in fact is a slightly bright ne'er do well with poor impulse control, no prospects and whose solution to getting off-world involved a mix of odd jobs at the starport, a handful of world-to-world transits working as a manual laborer/stowaway/cabinboy-or-girl and who

like water finding the easiest way to level

slid into joining the most recent conscription effort after being stuck on a backwater planet for the better part of a year with no near-term prospects of getting out any other way. A proper and mindful conscript they are not.

Caveat: all I know about 40K comes from the All Guardsman Party and the character concept is one part Halo Jones and one part